Screw driver



.Feb, 27, 191 23. I 1,446,877

' G. A. CARI-SON SCREW DRIVER Filed Nov. 19, 1920 lllllllll M IT s an r a;

I Q 5 1 hi??? etrsrAv A. CARLSON, or cHIcnGo, ILLINOIS, ASSIGNOR To THE Born NEEDLE COMPANY, or cnrcaeo, ILLInoIs, a'coaroaa rron orv IL Ino s.

scREw DRIVER.

Application filed November 19, 1920. semi No. 425,192.

To all'whom it may concern.

Be 1t known that I, Gus'rAv A. CAnLsoN, a cltizen of the United States, residing at Chicago, in the county of Cook and Stateof be manufactured at minimum cost andwhich is staunch and durable.

The invention is illustrated in its preferred embodiment in the accompanyingdrawing, in which Fig. 1 represents a plan view of a screwdriver constructed in accordance with the invention; .Fig. 2, a side elevational view of the same; Fig. 3, a broken sectional view taken as indicated at line 3 of Fig. 2; Fig.

4, a broken sectional view similar to Fig. 3, but with one of the parts shown in Fig.

3 removed; Fig. 5, a broken lower outer side view of the member shown in Fig. 4:; Fig. 6, a broken elevational view of the end portion of the loop-forming portion of the strip employed in the construction of the screw-driver; and Fig. 7, a broken plan view of the part shown in Fig. 6.

The improved screw-driver preferably is formed wholly from an integral strip of steel, which preferably is of flat form throughout. This strip has one end formed to provide a fiat blade 1 and has the opposite end portion formed to provide a loopform handle 2. The blade. 1 has a screwdriver tip 1, and has a shank portion 1 Ivhich is offset at one side of the plane of the blade 1. The continuation'of the strip is so formed as to provide the loop 2. Thus,

continuing from the shank portion 1 there is a divergent or oblique portion 2 a loop side 2 a rear loop-end 2, a loop side 2, a convergent or oblique portion 2 opposite the portion 2 and a shank portion 2 parallel with a bearing against the offset shank portion 1". The portion 2* constitutes the extreme end portion of the loop-forming part of the steel strip. The portion 2 is provided with a reducedextension 2 which affords a rivet. This rivet extends thru a ing a finished appearance.

central perforation 8 located at the junction of the blade 1 and the offset shank portion 1 The end of therivet-portion 2 is upset or riveted in the perforation 3, the perforation being provided with a countersink 3 to accommodate'the upset portion of the rivet.

extremity of the lcop-forming portion of the strip finds bearing against a shoulder 'i which is afl'orded by -offsetting the" "area. I

Asmay be noted from'Figs1 andf3, the

shank-portion l cfrom the plane of the blade v 1. The rivet portion 2? preferably forms an angle with the portion 2 which'is "slight ly obtuse,

will be understoodfrom; Fig.

3. After the riveting operation, any eX-" cess metal may be ground off, leaving the upset end ofthe rivet-flush withthe sur driver may be nickel-plated, if desired, thus practically obliterating the joints and giv- It may be added thata screw-driver may be formed in this mannermore cheaplyand of neater appearancethan could be accomplished by spot-welding the extremity of the loop-forming portion of the shank portion 1 7 The device is strong and durable the strip and rounding surface of the metal. The screw- 7 preferably is formed of a high'gradel of 5 steel, so that the blade may besuitably V tempered.

What I regard-as new, and desire to se} cure by Letters Patent,- is

1. A screw-driver comprising a steel strip having one end affording a blade and having the other end portion affording'a loopform handle, the extremity of theloop having an integral. rivet portion extending through a perforation in the shank atthe base portion of the loop and riveted the'reat.

2. A screw-drivercomprising a steel strip having-one end affording a'blade and .hav ing the other end; portion affording a'loop form handle ,the metal of the stria b61119 a l o offset toprovi'dea bearing for the extremity. of the loop-form portion ofthestrlp said eXtremityh-aving a reduced bentextension riveted in aperforation through the shank at the base portion of the loop.

" GUSTAV A. crimson. 

